This whole project relies on the little plastic thing that came with your iPod. It is normally used to help it dock it in an iHome or other speaker station for an iPod Classic. We'll be modifying it slightly for our cause. First you'll need to get a cutting tool (Dremel) and attach a grinding wheel. Open up the space on the bottom so the iPod side of the USB cable can slide through the space with a little friction. Don't make it too loose or it will be hard to make it stay. Next, hot glue it in the hole so your nano can attach and make an electronic connection. You can do this by keeping your iPod connected to the cable and pushing down to the plastic piece. After the glue dries (ACTUALLY DRY), take a small zip tie and make it hold down the buttons on the sides of the cable connector (this may only be necessary if you are using an older iPod cable). This is necessary so that you can pull your iPod in and out without much effort.